[clang] [libc++] Implement ranges::contains (PR #65148)

[via cfe-commits]

================
@@ -0,0 +1,252 @@
+//===----------------------------------------------------------------------===//
----------------
ZijunZhaoCCK wrote:

I add `robust` tests about projector, invoking and proxy iterators like `ranges::ends_with()` and `ranges::find()` but I don't add any `robust` tests about comparator because there is no comparator in `ranges::contains()`. Hope I miss nothing!

https://github.com/llvm/llvm-project/pull/65148